RT8805C 데이터 시트보기 (PDF) - Richtek Technology
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RT8805C Datasheet PDF : 18 Pages
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Preliminary
RT8805C
Functional Pin Description
Pin No.
VQFN-16L 3x3 VQFN-24L 4x4
16
1
Pin Name
PHASE1
12
19
PHASE2
1
2
UGATE1
11
18
UGATE2
2
3
BOOT1
10
17
BOOT2
3
4
AGND
4
5
IMAX
--
6, 8, 9, 10, 24 NC
5
7
RT
Exposed Pad (17)
11,
Exposed Pad (25)
GND
6
12
SS
7
13
COMP
8
14
FB
9
16
PGOOD
15
23
LGATE1
13
20
LGATE2
14
21, 22
VCC
--
15
PI
Pin Function
These pins are return nodes of the high-side driver. Connect
These pins to high-side MOSFET sources together with the
low-side MOSFET drains and the inductors.
Upper Gate Drive. These pins drive the gates of the high
side MOSFETs.
Bootstrap Power Pin. These pins power the high-side
MOSFET drivers. Connect These pins to the junctions of the
bootstrap capacitors.
Chip Analog Ground.
Maximum Current Setting. This pin sets the current limiting
level. Connect this pin with resistor to ground to set the
current limit.
No Internal Connection.
Timing Resistor. Connect a resistor from RT to AGND to set
the clock frequency.
The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Soft-Start Pin. This pin provides soft-start function for
controller. The COMP voltage of the converter follows the
ramping voltage on the SS pin.
Compensation Pin. This pin is output node of the error
amplifier.
Feedback Pin. This pin is negative input pin of the error
amplifier.
Power Good. PGOOD is an open drain output used to
indicate the status of the voltages on SS pin and FB pin.
PGOOD will go high impedance when SS > 3.7V and FB >
0.6V.
Lower Gate Drive. These pins drive the gate of the lowside
MOSFETs.
The VCC pin is the external 12V power. Internal 5V power
(VDD) is regulated from this pin. This pin also powers the low
side MOSFET drivers.
External reference voltage pin. This pin sets the voltage of
FB pin when close loop.
DS8805C-03 August 2007
www.richtek.com
5
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